Method readMetadata

src/rafimage.cpp:224–322

}  // RafImage::printStructure

void RafImage::readMetadata() {
#ifdef EXIV2_DEBUG_MESSAGES
  std::cerr << "Reading RAF file " << io_->path() << "\n";
#endif
  if (io_->open() != 0)
    throw Error(ErrorCode::kerDataSourceOpenFailed, io_->path(), strError());
  IoCloser closer(*io_);
  // Ensure that this is the correct image type
  if (!isRafType(*io_, false)) {
    if (io_->error() || io_->eof())
      throw Error(ErrorCode::kerFailedToReadImageData);
    throw Error(ErrorCode::kerNotAnImage, "RAF");
  }

  clearMetadata();

  if (io_->seek(84, BasicIo::beg) != 0)
    throw Error(ErrorCode::kerFailedToReadImageData);
  byte jpg_img_offset[4];
  if (io_->read(jpg_img_offset, 4) != 4)
    throw Error(ErrorCode::kerFailedToReadImageData);
  byte jpg_img_length[4];
  if (io_->read(jpg_img_length, 4) != 4)
    throw Error(ErrorCode::kerFailedToReadImageData);
  uint32_t jpg_img_off_u32 = Exiv2::getULong(jpg_img_offset, bigEndian);
  uint32_t jpg_img_len_u32 = Exiv2::getULong(jpg_img_length, bigEndian);

  Internal::enforce(Safe::add(jpg_img_off_u32, jpg_img_len_u32) <= io_->size(), ErrorCode::kerCorruptedMetadata);

  auto jpg_img_off = static_cast<long>(jpg_img_off_u32);
  auto jpg_img_len = static_cast<long>(jpg_img_len_u32);

  Internal::enforce(jpg_img_len >= 12, ErrorCode::kerCorruptedMetadata);

  DataBuf jpg_buf(jpg_img_len);
  if (io_->seek(jpg_img_off, BasicIo::beg) != 0)
    throw Error(ErrorCode::kerFailedToReadImageData);

  if (!jpg_buf.empty()) {
    io_->read(jpg_buf.data(), jpg_buf.size());
    if (io_->error() || io_->eof())
      throw Error(ErrorCode::kerFailedToReadImageData);
  }

  // Retrieve metadata from embedded JPEG preview image.
  try {
    auto jpg_io = std::make_unique<Exiv2::MemIo>(jpg_buf.data(), jpg_buf.size());
    auto jpg_img = JpegImage(std::move(jpg_io), false);
    jpg_img.readMetadata();
    setByteOrder(jpg_img.byteOrder());
    xmpData_ = jpg_img.xmpData();
    exifData_ = jpg_img.exifData();
    iptcData_ = jpg_img.iptcData();
    comment_ = jpg_img.comment();
  } catch (const Exiv2::Error&) {
  }

  exifData_["Exif.Image2.JPEGInterchangeFormat"] = getULong(jpg_img_offset, bigEndian);